Progress in science comes when experiments contradict theory.

As you know, a theory in physics is not useful unless it is able to predict underlined effects which we would otherwise expect.

We absolutely must leave room for doubt or there is no progress and no learning. There is no learning without having to pose a question. And a question requires doubt. People search for certainty. But there is no certainty.

Science is of value because it can produce something.

Nature uses only the longest threads to weave her patterns, so that each small piece of her fabric reveals the organization of the entire tapestry.

Physicists like to think that all you have to do is say, these are the conditions, now what happens next?

People may come along and argue philosophically that they like one better than another; but we have learned from much experience that all philosophical intuitions about what nature is going to do fail.